This experiment was conducted to evaluate the effect of cottonseed meal and cotton seed flour on the reproductive behavior and on the testis activity of Nile tilapia broodstock. Twenty-five fishes were fed diets containing 0, 2, 4 and 6% ground cottonseed flour and 24% cottonseed meal (CSM). The reproductive behavior of the fishes was daily observed and the nest construction, courtship and spawning were evaluated. At 90 days, the males gonads were microscopically evaluated. The control group (soybean meal) showed […]

The objectives of this work were to estimate the dry matter intake by animals grazing three cultivars of Panicum maximum, and to relate it to live weight gain, grazing time (GT) and some structural and chemical characteristics of the pastures. The experimental design was the randomized block with three treatments and three replicates. The dry matter voluntary intake (DMVI) was estimated in four periods (May, September, November and February). Fecal output was measured using chromic oxide as an external marker. […]

The objective of this work was to verify the effect of ammoniation on the contents of crude protein (CP), nitrogen retention (NR), dry matter (DM) content, preservation, cell wall constituents and in vitro dry matter disappearance (IVDMD) of cracked corn with high moisture (25%). Four levels of anhydrous ammonia (0, 1, 2 and 3%) and five aeration periods (0, 7, 14 21, and 28 days) were studied using a completely randomized design, in a split plot design. The contents of […]

This trial was carried out, from October 1993 until June 1995, to evaluate the chemical composition and dry matter digestibility of dwarf elephantgrass at plant heights of 80 and 120 cm under five nitrogen rates. The experimental design was completely randomized with a split split plot arrangement, with four replicates, where the clipping factors, and nitrogen doses (0, 25, 50, 100kg/ha•clipping, in the first year, and 0, 75 and 100 kg ha•clipping, in the second year, and plant heights (80 and […]

Sugarcane bagasse with 55% of dry matter (DM) was treated with five levels of urea (0, 2.5, 5, 7.5, and 10%) and 5% ground whole soybean as a source of urease both, on a DM basis. The material was stored in plastic bags for 97 days (8 kg/ 50 L plastic bag), and after plastic bag opening, samples were collected at three aeration period (2, 9, and 16 days). A completely randomized design with three replicates was used. There was […]

This study was carried out to study the combining ability of parental broiler lines using factor analysis of production traits. The single crosses (partial diallel) among the male lines of group 1 (LL, TL, ZL, TT, LT, ZT, ZZ, LZ, and TL) and female lines of group 2 (PP, KP, VP, KK, PK, VK, VV, PV, and KV). A completely randomized blocks design, with three blocks, 81 single crosses and nine females per cross was used. The production traits, were […]

With respect to beef cattle breeding, the emphasis devoted by researchers, beef cattle producers and beef cattle experts has been, in general, focused on identification, evaluation and selection of sires. Little attention has been given to the pathway used to spread the genes from such sires throughout the population as a whole. The reported low annual genetic progress observed in several herds might suggest that, in spite of having some success in promoting genetic improvement as observed in isolated herds, […]

This experiment was carried out to verify the effect of the administration of different doses of GnRH (buserelin) analogue on the emergence of a new follicular growth wave and the number of recruited follicles from this wave, accessory corpus luteum formation, the dominant follicle diameter and the spontaneous corpus luteum on the luteolitic administration day and subsequent synchronization rate and the interval between the PGF2α application and the estrus manifestation. Twenty crossbreed female cattle in diestrus, crossbred Holstein x Zebu […]

The objective of this work was to calculate adjustment factors for milk and fat yield according to the cow age and calving season, for Holstein breeds herds from Minas Gerais State. The statistical analyses were made by means of mixed models, using Restricted Maximum Likelihood in an animal model. The fixed effects were herd-year, genetic composition and age classes-calving season, and as random effects of animal (cow, sire and dam) and error terms. Records used in the analysis were 49,666 […]

The objective of this work was to identify the best semen extender, the dilution rate and the storage time for rooster semen. A total of 60 roosters and 630 hens with 55 weeks of age were artificially inseminated, once a week, by six consecutive weeks, using .05 mL of semen/hen. The treatments were: T1=semen diluted with commercial extender-DC; T2 =semen diluted with Beltsville Poultry Semen Extender-BPSE; T3=semen diluted with Lake solution-LAKE and T4=pure fresh semen (Control). The dilution levels (D) […]